The DM of my current Friday night game is running a steampunk-setting, using the Pathfinder rules system. We have two artificers in the party, but my feeling is that all of our material is fantasy and medieval tech, and anything that is modern or really "steampunk" is just being made up by the DM.

Are there any good source materials for steampunk or modern technology in d20? I am sorely underwhelmed by D20 Modern, and Spycraft is awesome, but doesn't play nicely with other d20 systems. I am also ruling out BESM, unless there is some supplemental material for it that's particular to modern weapons.

Sorcery & Steam (Fantasy Flight Games) and OGL Steampunk (Mongoose Publishing) are older steampunk rulebooks for the OGL games. As far as I know they are both out of print but available from RPGNow as PDFs.

Imperial Age (Adamant Entertainment) is a steampunk rule set (with many books available through RPGNow) for the d20 Modern rules.

Privateer Press published Iron Kingdoms, a d20 campaign setting which mixed fantasy and steampunk elements. The most useful sourcebook for a general steampunk game would be Liber Mechanika. It contains an arcane mechanik class along with rules for creating the arcane machines.

Unfortunately the books for this are out of print, but I believe there are PDFs for sale via drivethrurpg.
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MadMAxJrAug 23 '10 at 18:08

@MadMAxJr The PDFs are for sale at DriveThruRPG and RPGNow. I linked Liber Mechanika to its product page on DriveThruRPG.
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Eric WeilnauAug 23 '10 at 18:20

1

It's a great system but it painfully shoehorns Iron Kingdoms concepts into d20 rules, as a result some things are a tad complicated. The mechanika crafting rules may require a few readings before you understand them. In the main supplement, magic users will need to note the changes from typical D&D magic (Healing has limits, some arcane magic draws infernal attention, etc). If you can work past all of that, it is a very rich setting. The world guide is almost entirely setting description material with bits of artwork.
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MadMAxJrAug 23 '10 at 18:46

There are two I can recommend: Mongoose's OGL Steampunk and Goodman Games' Etherscope. The first is more generic, while the second develops its own custom setting, but both are decent d20 adaptations of the genre.

For a while I tried Sorcery & Steam but found that it was really just a re-skinning of magic items.

There are rules for building steampunk-esque equipment in the World of Warcraft d20 rulebook, which seemed interesting, though I've yet to play them. It allows a character a lot of flexibility in designing and building a custom item, without it being too cimplicated.

There's a new Campaign Setting called Thunderscape that's incredibly steampunk. Classes, races, tons of fluff. The book's crunch is not extremely well-written for as technical a game as Pathfinder, but an errata is expected - and the both the crunch and fluff are very interesting. One of our players used Aden (the Thunderscape setting) for a book report. New classes, reworked firearm and vehicle rules, tons of other stuff. It can be found on DriveThruRPG.